National geographic
Okanogan County heritage
The Oregon Trail by Buck, Rinker
Late frontier by Wilson, Bruce A
Indians of the Pacific Northwest by Ruby, Robert H
The North Cascades by Dietrich, William
Washington by Tieck, Sarah
Wildflowers of the Pacific Northwest by Turner, Mark
Sagebrush country by Taylor, Ronald J
A guide to the Indian tribes of the Pacific Northwest by Ruby, Robert H
Sources of the river by Nisbet, Jack
The Rusty Dusty by McCulloch, Mac
Hiking through history, Washington by Barnes, Nathan
Okanogan County ... a profile by Widel, Glen
Ranching in the Okanogan
Fire, faults & floods by Mueller, Marge
The cactus eaters by White, Dan
Building the Columbia River Highway by Willis, Peg
Roadside geology of Washington by Alt, David D
Pacific Northwest medicinal plants by Kloos, Scott
Exploring Washington's backroads by Deviny, John
Stern-wheelers up Columbia by Mills, Randall Vause
Told by the pioneers by United States. Works Progress Administration (Wash.)
Northwest weeds by Taylor, Ronald J